glcontext_eagl: do not try to fallback on gles 2.0 if the context creation failed
glcontext_eagl: do not try to fallback on gles 2.0 if the context creation failed

OpenGLES 3.0 is supported since the iPhone 5S (A7 chip) released in
September 2013.

gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl